Date.prototype.Format = function (fmt) {
    var o = {
        "M+": this.getMonth() + 1, //月份
        "d+": this.getDate(), //日
        "H+": this.getHours(), //小时
        "m+": this.getMinutes(), //分
        "s+": this.getSeconds(), //秒
        "q+": Math.floor((this.getMonth() + 3) / 3), //季度
        "S": this.getMilliseconds() //毫秒
    };
    if (/(y+)/.test(fmt)){
        fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    }
    for (var k in o){
        if (new RegExp("(" + k + ")").test(fmt)){
            fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
        }
    }
    return fmt;
}
Date.prototype.compareDate=function (s1,s2) {

    if((new Date(s1.replace(/-/g,"\/")))>(new Date(s2.replace(/-/g,"\/")))){
        return -1;

    }else if((new Date(s1.replace(/-/g,"\/")))<(new Date(s2.replace(/-/g,"\/")))){
        return 1;
    }else{
        return 0;
    }
}
